Update the changelog.

CHANGELOG

@@ -1,20 +1,32 @@
 # Change Log
 All notable changes to `nalgebra`, starting with the version 0.6.0 will be
-documented in this file (sorry I didn't maintain one before).
+documented here.
 
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [unreleased] [0.6.0]
+## [0.6.0]
+**Announcement:** a users forum has been created for `nalgebra`, `ncollide`, and `nphysics`. See
+you [there](http://users.nphysics.org)!
+
 ### Added
-  * (feature=generic_sizes): Dependency to [generic-array](https://crates.io/crates/generic-array)
-  * (feature=ganedic_sizes): Staticly sized vectors with user-defined sizes: `VecN`.
+  * Dependency to [generic-array](https://crates.io/crates/generic-array). Feature-gated: requires
+  `features="generic_sizes"`.
+  * Staticly sized vectors with user-defined sizes: `VecN`. Feature-gated: requires
+  `features="generic_sizes"`.
   * Similarity transformations (an uniform scale followed by a rotation followed
     by a translation): `Sim2`, `Sim3`.
 
 ### Removed
-  * Zero-sized elements `Vec0`, `Pnt0`.
-  * Incomplete 4-dimensional transformations `Rot4` and `Iso4`.
+  * Removed zero-sized elements `Vec0`, `Pnt0`.
+  * Removed 4-dimensional transformations `Rot4` and `Iso4` (which had an implementation to incomplete to be useful).
 
 ### Modified
   * Vectors are now multipliable à isometries. This will result into a pure rotation (this is how
   vectors differ from point semantically: they design directions so they are not translatable).
+  * `{Iso3, Rot3}::look_at` reimplemented and renamed to `::look_at_rh` and `::look_at_lh` to agree
+  with the computer graphics community (in particuliar, the GLM library). Use the `::look_at_rh`
+  variant to build a view matrix that
+  may be successfully used with `Persp` and `Ortho`.
+  * The old `{Iso3, Rot3}::look_at` implementations are now called `::new_observer_frame`.
+  * Rename every `fov` on `Persp` to `fovy.
+  * Fixed the perspective and orthographic projection matrices.